Cascaded Two-Level Inverter using Fuzzy logic Based multilevel STATCOM for High –Power Applications

Abstract

Multilevel inverters have received more attentions their considerable advantages such as high power quality, lower harmonic components, better electro- magnetic consistence, lower dv/dt and lower switching losses. Lot of research was going on multi level inverter topologies and many researchers are proposed so many multi level inverter topologies. In this paper, a simple static var compensating scheme using a cascaded two-level inverter-based multilevel inverter is proposed. The topology consists of two standard two-level inverters connected in cascade through open-end windings of a three-phase transformer. The dc-link voltages of the inverters are regulated at different levels to obtain four-level operation. The simulation study is carried out in MATLAB/SIMULINK to predict the performance of the proposed scheme under balanced and unbalanced supply-voltage conditions.

Keywords: DC-link voltage balance; multilevel inverter; power quality (PQ); static compensator (STATCOM)